Feeling Slumpy? These Surprising Energy-Boosting Foods Just Might Wake You Up

It's loaded with nutrients—fiber, vitamin K (for your bones), lutein (for your eyes)—and some research shows that it might even help make your muscles work more efficiently during a workout. But! The leafy greens also have tons of iron...which means spinach may actually even perk you up when you're feeling tired.

But spinach isn't the only food that can help pull you out of a yawn-filled afternoon (who hasn't had one of those? And, um, if you haven't, please share your secrets!).

Greek yogurt: A serving of the low-fat creamy treat can pack twice the protein of a regular yogurt, which helps keep energy levels up. It also has less sugar (minimizing the chances of a possible later sugar crash).